using System.Numerics;

public class Program
{
    public static void Main()
    {

        //BigInteger num = BigInteger.Parse(Console.ReadLine() ?? string.Empty);
        //int num = int.Parse(Console.ReadLine() ?? string.Empty);
        string[] moji = (Console.ReadLine() ?? string.Empty).Trim().Split(' ');
        //string str = Console.ReadLine() ?? string.Empty;
        
        BigInteger h = BigInteger.Parse(moji[0]);
        BigInteger s = BigInteger.Parse(moji[1]);

        if((h+s) % 2==0)
        {
            Console.WriteLine("Possible");
        }
        else
        {
            Console.WriteLine("Impossible");
        }
    }
}